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Evaluation of sympathetic nervous system function in normal and spontaneously hypertensive rat hearts with dynamic SPECT imaging

机译:动态SPECT成像评估正常和自发性高血压大鼠心脏的交感神经系统功能

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123I-MIBG is an analogue of the norepinephrine uptake in the presynaptic portion of the sympathetic neurons that innervate the heart. The abnormal metabolism of 123I-MIBG is used to diagnose potential heart failure. This paper quantitatively compares the metabolism of 123I-MIBG in SHRs and Wistar-Kyoto normal rats. Dynamic projection data were acquired for 100 min in 1-sec time frames with an angular step of 2 degrees per frame on a dual-head GE Millennium VG Hawkeye SPECT/CT scanner equipped with custom pinhole collimators. The time activity curves of radiotracer in blood pool and myocardium were extracted from the projections through the spatiotemporal dimension reduction method developed previously for dynamic cardiac SPECT reconstruction. The kinetic parameters were estimated by fitting the estimate time activity curves to a compartmental model. The distribution volumes (DVs) of the radiotracer in the myocardium were calculated. The DV of SHRs was greater (p=2.4E−4) than that of WKY normal rats, indicating the development of cardiac hypertrophy in the SHRs.
机译: 123 I-MIBG是神经支配性交感神经元突触前部分中去甲肾上腺素摄取的类似物。 123 I-MIBG的异常代谢被用于诊断潜在的心力衰竭。本文定量比较了SHRs和Wistar-Kyoto正常大鼠中 123 I-MIBG的代谢。在配有定制针孔准直仪的双头GE Millennium VG Hawkeye SPECT / CT扫描仪上,在1秒的时间帧内以每帧2度的角步进获取了100分钟的动态投影数据。通过先前为动态心脏SPECT重建开发的时空降维方法,从投影中提取了血池和心肌中放射性示踪剂的时间活动曲线。通过将估计的时间活动曲线拟合到隔室模型来估计动力学参数。计算了心肌中放射性示踪剂的分布体积(DVs)。 SHRs的DV比WKY正常大鼠大(p = 2.4E-4),表明SHRs出现了心脏肥大。

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